97 lines
3.5 KiB
C
97 lines
3.5 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
|
||
|
|
*
|
||
|
|
* Use of this source code is governed by a BSD-style license
|
||
|
|
* that can be found in the LICENSE file in the root of the source
|
||
|
|
* tree. An additional intellectual property rights grant can be found
|
||
|
|
* in the file PATENTS. All contributing project authors may
|
||
|
|
* be found in the AUTHORS file in the root of the source tree.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef API_VIDEO_VIDEO_BITRATE_ALLOCATION_H_
|
||
|
|
#define API_VIDEO_VIDEO_BITRATE_ALLOCATION_H_
|
||
|
|
|
||
|
|
#include <stddef.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#include <limits>
|
||
|
|
#include <string>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
#include "absl/types/optional.h"
|
||
|
|
#include "api/video/video_codec_constants.h"
|
||
|
|
#include "rtc_base/system/rtc_export.h"
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
|
||
|
|
// Class that describes how video bitrate, in bps, is allocated across temporal
|
||
|
|
// and spatial layers. Not that bitrates are NOT cumulative. Depending on if
|
||
|
|
// layers are dependent or not, it is up to the user to aggregate.
|
||
|
|
// For each index, the bitrate can also both set and unset. This is used with a
|
||
|
|
// set bps = 0 to signal an explicit "turn off" signal.
|
||
|
|
class RTC_EXPORT VideoBitrateAllocation {
|
||
|
|
public:
|
||
|
|
static constexpr uint32_t kMaxBitrateBps =
|
||
|
|
std::numeric_limits<uint32_t>::max();
|
||
|
|
VideoBitrateAllocation();
|
||
|
|
|
||
|
|
bool SetBitrate(size_t spatial_index,
|
||
|
|
size_t temporal_index,
|
||
|
|
uint32_t bitrate_bps);
|
||
|
|
|
||
|
|
bool HasBitrate(size_t spatial_index, size_t temporal_index) const;
|
||
|
|
|
||
|
|
uint32_t GetBitrate(size_t spatial_index, size_t temporal_index) const;
|
||
|
|
|
||
|
|
// Whether the specific spatial layers has the bitrate set in any of its
|
||
|
|
// temporal layers.
|
||
|
|
bool IsSpatialLayerUsed(size_t spatial_index) const;
|
||
|
|
|
||
|
|
// Get the sum of all the temporal layer for a specific spatial layer.
|
||
|
|
uint32_t GetSpatialLayerSum(size_t spatial_index) const;
|
||
|
|
|
||
|
|
// Sum of bitrates of temporal layers, from layer 0 to |temporal_index|
|
||
|
|
// inclusive, of specified spatial layer |spatial_index|. Bitrates of lower
|
||
|
|
// spatial layers are not included.
|
||
|
|
uint32_t GetTemporalLayerSum(size_t spatial_index,
|
||
|
|
size_t temporal_index) const;
|
||
|
|
|
||
|
|
// Returns a vector of the temporal layer bitrates for the specific spatial
|
||
|
|
// layer. Length of the returned vector is cropped to the highest temporal
|
||
|
|
// layer with a defined bitrate.
|
||
|
|
std::vector<uint32_t> GetTemporalLayerAllocation(size_t spatial_index) const;
|
||
|
|
|
||
|
|
// Returns one VideoBitrateAllocation for each spatial layer. This is used to
|
||
|
|
// configure simulcast streams. Note that the length of the returned vector is
|
||
|
|
// always kMaxSpatialLayers, the optional is unset for unused layers.
|
||
|
|
std::vector<absl::optional<VideoBitrateAllocation>> GetSimulcastAllocations()
|
||
|
|
const;
|
||
|
|
|
||
|
|
uint32_t get_sum_bps() const { return sum_; } // Sum of all bitrates.
|
||
|
|
uint32_t get_sum_kbps() const {
|
||
|
|
// Round down to not exceed the allocated bitrate.
|
||
|
|
return sum_ / 1000;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool operator==(const VideoBitrateAllocation& other) const;
|
||
|
|
inline bool operator!=(const VideoBitrateAllocation& other) const {
|
||
|
|
return !(*this == other);
|
||
|
|
}
|
||
|
|
|
||
|
|
std::string ToString() const;
|
||
|
|
|
||
|
|
// Indicates if the allocation has some layers/streams disabled due to
|
||
|
|
// low available bandwidth.
|
||
|
|
void set_bw_limited(bool limited) { is_bw_limited_ = limited; }
|
||
|
|
bool is_bw_limited() const { return is_bw_limited_; }
|
||
|
|
|
||
|
|
private:
|
||
|
|
uint32_t sum_;
|
||
|
|
absl::optional<uint32_t> bitrates_[kMaxSpatialLayers][kMaxTemporalStreams];
|
||
|
|
bool is_bw_limited_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace webrtc
|
||
|
|
|
||
|
|
#endif // API_VIDEO_VIDEO_BITRATE_ALLOCATION_H_
|